对3.6以下的版本不支持

[elid0928]

Describe the bug
A clear and concise description of what the bug is, and what you expected to happen.
在readme文档中看到支持的mongodb版本是2.6及以上， 但在测试时， 该并不支持mongodb 3.0.9, 根据项目介绍，是基于官方库go.mongodb.org/mongo-driver 的项目， 官方库标注的是仅支持mongodb 3.6 以上的版本

To Reproduce
Codes to reproduce the behavior.

driver: github.com/qiniu/qmgo v1.1.8
mongodb version: 3.0.9
go version: 1.20

server at 172.17.0.3:27017 reports wire version 3, but this version of the Go driver requires at least 6 (MongoDB 3.6)
new client fail server at 172.17.0.3:27017 reports wire version 3, but this version of the Go driver requires at least 6 (MongoDB 3.6)
connect error server at 172.17.0.3:27017 reports wire version 3, but this version of the Go driver requires at least 6 (MongoDB 3.6)

Additional context
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[jiangz222]

Yes, I think official go driver add this limitation.
I can do Nothing but using early version.

[jiangz222]

I will update the README

[zandwang]

Looks like I'm going back to mgoV2